If you have had your keys stolen or you cannot find them, you should have your locks changed. Someone could have taken your keys and had copies made.

If you are going through a divorce, you need to have your locks replaced. Even if you are going through an amicable separation, you still want to make sure that you keep things secure. People often do not think straight when they are emotional.

Maybe your home has been burgled. If so, you should definitely have your locks changed. Make sure the lock is burglar-proof or upgrade your current lock.

If your lock has been damaged, get it changed. Any defect in a lock is not a good thing. Take measures immediately to have the lock replaced.

Do Not Lend Out Keys

Never make it a practice to lend out keys either. Doing so will defeat the purpose of having a lock in place.